#define _CRT_SECURE_NO_WARNINGS 1

#include<iostream>
using namespace std;

void func()
{
	;
}

int main()
{
	int a = 12;

	int& ra = a;
	ra = 20;

	int* pa = &a;
	*pa = 20;

	//func(a, a);

	return 0;
}